[TYPO3] Backend users can't create new pages

[Peter Klein]

Hi List. I have a weird  problem on one of my sites, which I just updated to 
TYPO3 v4.02.

The site is not using TemplateVoila..
The BE User full access to creating/deleting/editing content and pages.
The BE User has access to ALL pagerelated fields.

When a BE user clicks on the "New Page" button on a page, and selects where 
in the pagetree the new page should be created, then TYPO3 gives this error 
msg:

-- cut --
Access Error

You don't have access to this module.
-- cut --

The weird thing is that if the BE user clicks on the Icon in the pagetree, 
and select "New" and then "Page After" then the page is created correctly.
But if the BE user clicks on the Parent icon of a page, and select "New" and 
then "Page inside" then I get the same error.

Does anyone have any suggestions on what might be wrong?

-- 
Peter Klein/Umloud Untd